EP 0999539 A1 20000510 - CONTROLLING METHOD AND APPARATUS OF CONSTANT-FREQUENCY SOUND-PRODUCTION OF ELECTRICAL HORN
Title (en)
CONTROLLING METHOD AND APPARATUS OF CONSTANT-FREQUENCY SOUND-PRODUCTION OF ELECTRICAL HORN
Title (de)
KONTROLLVERFAHREN UND VORRICHTUNG ZUR ERZEUGUNG EINES TONS KONSTANTER FREQUENZ MIT EINER ELEKTRISCHEN HUPE
Title (fr)
PROCEDE ET APPAREIL DE COMMANDE DE LA PRODUCTION DE SON A FREQUENCE CONSTANTE D'UN PAVILLON ELECTRIQUE
Publication
Application
Priority
- CN 9800135 W 19980728
- CN 97112878 A 19970729
Abstract (en)
Controlling method and apparatus of constant-frequency sound-production of electrical horn are described. These are achieved and comprised by a monolithic-computer. It's characterized in that frequency pulse output from constant-frequency oscillator is corrected as base resonent frequency of each horn (accurary at least ?.05 Hz), thereby the horns can operate in optimum condition driven by electrical driving signal, duty cycle of the driving signal can be arbitrarily adjusted in the range from 1-99 % based on sound production feature of different horns. <IMAGE>
IPC 1-7
IPC 8 full level
B60Q 5/00 (2006.01); G10K 9/12 (2006.01); G10K 15/04 (2006.01)
CPC (source: EP KR US)
Designated contracting state (EPC)
DE FR
DOCDB simple family (publication)
WO 9906989 A1 19990211; AU 8527998 A 19990222; CN 1078726 C 20020130; CN 1170896 A 19980121; CN 1265769 A 20000906; DE 69841887 D1 20101021; EP 0999539 A1 20000510; EP 0999539 A4 20050202; EP 0999539 B1 20100908; JP 2001512254 A 20010821; KR 100525806 B1 20051103; KR 20010022448 A 20010315; US 6456193 B1 20020924
DOCDB simple family (application)
CN 9800135 W 19980728; AU 8527998 A 19980728; CN 97112878 A 19970729; CN 98807769 A 19980728; DE 69841887 T 19980728; EP 98936070 A 19980728; JP 2000505631 A 19980728; KR 20007001033 A 20000129; US 46348300 A 20000314